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In a pointer, you can usecap()Function to find the capacity of a pointer. This is a built-in function that returns the capacity of a pointer to an array. In Go language, capacity defines the maximum number of elements stored in a pointer to an array. This function is defined internally.
Syntax:
func cap(l Type) int
Here,lThe type is a pointer. Let's discuss this concept with an example:
// Go program to demonstrate how to find
//The capacity of the pointer to the array
package main
import (
"fmt"
)
func main() {
//Create and initialize
//Pointing to an array
//Using the var keyword
var ptr1 [7]*int
var ptr2 [5]*string
var ptr3 [8]*float64
//Find the capacity
//Pointing to an array
//Using cap() function
fmt.Println("ptr1 Capacity: ", cap(ptr1))
fmt.Println("ptr2 Capacity: ", cap(ptr2))
fmt.Println("ptr3 Capacity: ", cap(ptr3))
}Output:
ptr1 Capacity: 7 ptr2 Capacity: 5 ptr3 Capacity: 8
Example of Go getting the capacity of array pointers2:
package main
import (
"fmt"
)
func main() {
//Create an array
arr := [8]int{200, 300, 400, 500, 600, 700, 100, 200}
var x int
//Create a pointer
var p [5]*int
//Allocate address
for x = 0; x < len(p); x++ {
p[x] = &arr[x]
}
//Display the result
for x = 0; x < len(p); x++ {
fmt.Printf("The value of p[%d] = %d\n", x, *p[x])
}
// Use the cap() function to find the capacity
fmt.Println("The capacity of arr: ", cap(arr))
fmt.Println("The capacity of p: ", cap(p))
}Output:
p[0] The value of = 200 p[1The value of = 300 p[2The value of = 400 p[3The value of = 500 p[4The value of = 600 The capacity of arr: 8 The capacity of p: 5